SimplifyBooleanExpressionCheck.java
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com.puppycrawl.tools.checkstyle.checks.coding |
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Checkstyle |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
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////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2007 Oliver Burn
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
package com.puppycrawl.tools.checkstyle.checks.coding;
import com.puppycrawl.tools.checkstyle.api.Check;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
/**
* <p>
* Checks for overly complicated boolean expressions. Currently finds code like
* <code>if (b == true)</code>, <code>b || true</code>, <code>!false</code>,
* etc.
* </p>
* <p>
* Rationale: Complex boolean logic makes code hard to understand and maintain.
* </p>
* <p>
* An example of how to configure the check is:
* </p>
* <pre>
* <module name="SimplifyBooleanExpression"/>
* </pre>
* @author lkuehne
*/
public class SimplifyBooleanExpressionCheck
extends Check
{
/** {@inheritDoc} */
public int[] getDefaultTokens()
{
return new int[] {TokenTypes.LITERAL_TRUE, TokenTypes.LITERAL_FALSE};
}
/**
* Prevent user from changing tokens in the configuration.
* @see com.puppycrawl.tools.checkstyle.api.Check
* @return an empty array.
*/
public int[] getAcceptableTokens()
{
return new int[] {};
}
/** {@inheritDoc} */
public int[] getRequiredTokens()
{
return new int[] {TokenTypes.LITERAL_TRUE, TokenTypes.LITERAL_FALSE};
}
/** {@inheritDoc} */
public void visitToken(DetailAST aAST)
{
final DetailAST parent = aAST.getParent();
switch (parent.getType()) {
case TokenTypes.NOT_EQUAL:
case TokenTypes.EQUAL:
case TokenTypes.LNOT:
case TokenTypes.LOR:
case TokenTypes.LAND:
log(parent.getLineNo(), parent.getColumnNo(),
"simplify.expression");
break;
default:
break;
}
}
}
The table below shows all metrics for SimplifyBooleanExpressionCheck.java.
| Metric | Value | Description | |
|---|---|---|---|